Manufacture of car-wheels



2 Sheets-Sheet ,1

(Model) Z. s. & L.' W. WASHBU.RN.

MANUFACTURE OF GAR WHEELS.

Patented 1m. 6,1881,

%/WIZNESEE'S (ModeL) 2 Sheets-Sheet 2.

'Z'. S. &7 L. W. WASHBURN.

MANUFACTURE OF GAR WHEELS.

No. 250,407. Patented Dad. 6,1881.

UNITED STATES PATENT Grates.

ZADOOK S. WASHBURN, OF CHELSEA, AND LUOIUS W. WASHBURN, OF BOSTON, MASSACHUSETTS.

MANUFACTURE OF CA R-WH EELS.

SPECIFICATION forming part of Letters Patent No. 250,407, dated December 6, 1881.

Application filed December 20, 1880. (Model.)

To all whom it may concern Beit known that we, ZADOGK S. WASHBURN, of Chelsea, in the county of Suffolk and State of Massachusetts, and LUCIUS W. WASHBURN, of Boston, in the county and State aforesaid, have invented certain new and useful Improvements in Molds for Casting .Oar-WVheels, of which the following is a specification.

The object of our invention is to provide a mold for casting car-wheels from two metals, the central or main body portion being cast from common iron, and then, the mold being quickly changed, the tire is cast around the same from decarbonized iron or steel, which is susceptible of receiving a very hard chill, as heretofore. It is found very difficult to cast wheels from two metals poured at different times into the same mold, or,wherein the tire is first cast, then transferred to another mold, wherein the central or body portion is subsequently cast, of forming a perfect union or joining of the two metals, on account ofthe time required to make the necessary changes after the first cast metal has become partially cooled or crystallized, so as to permit of such removal, or of the removal of a stop-ring formed in sections and removed outward or horizontally first, before being lifted upward from the mold, as heretofore employed, such construction requiring sufficient time to allow the first cast metal to become too cool before the second metal can be cast therein, whereby a perfect union of the two metals cannot at all times be made, thereby occasioning great loss in labor and material. These and other objections are fully overcome by our invention, which consists in the construction, combination, and arrangement of the various parts forming the mold, which may be changed in the shortest space of time possible, as hereinafter more fully described and set forth.

Figure 1 is aperspective view of a mold constructed according to our invention, adapted to form the cast central body portion of a carwheel. Fig. 2 is a vertical central section of thesame, with that portion of the car-wheel cast therein. Fig. 3 is a similar view of the mold complete, with the car-wheel and its tire cast therein. Fig. 4 is a perspective view of the chill-ring used in casting the tire. Fig. 5 is a similar view of the extra cope used in casting the tire.

A represents the lower portion of the mold, upon which rests the horizontal flange a of the metallic ring B, the interior face of which inclines inwardly, being tapering or conical, and against which the periphery of the central or body portion, 0, of the wheel is cast, as seen in Fig. 2. This metallic ring B is held firmly in position temporarily by means of the pins 0 projecting vertically from the horizontal lugs formed upon the portion A,and passing through corresponding holes formed in similar lugs formed upon the flange a, as shown.

D represents the cope, through the ingates or sprue-holes at the center of which the metal is poured to form the center or body portion 0 of the wheel, being cast of soft iron. This cope D is formed externally of the same taper, incline, or conically, as the inner face or interior of the upper portion of the metallic ring B, or so as to fit snugly within the same, when the two parts are brought together and secured in position by means of the horizontal pins 61, extending through the upper portion of the said ring B, and into or through the contiguous portion of the cope D, whereby it is prevented from dropping down into the mold be fore the metal is cast therein. Now, as soon as the said center or body portion 0 of the wheel has been cast and sufficiently cooled as to set at its periphery, which contacts with the interior face of the metal ring B, the said pins 01 are withdrawn and the ring B lifted upward and removed from the said portion A, leaving the central cope, D, in place or position undisturbed, and resting upon the upper edge of the rim of the wheel-body G j ust cast, and by which it is supported. Now, a second metallic chillring, E, as shown in Fig. 4, of larger interior diameter than the removed ring B, is instantly substituted therefor, as shownin Fig.3, whereby the desired space is left between the interior of the said chill-ring E and the periphery ofthe bodyUjustcast, which serve as a mold for the steel tire e, an extra cope, G, (shown in Figs. 3 and 5,) of larger diameter than the cope D, and adapted to slip down over it, being put on kw n at the same time as the chill-ring E, on which it rests. Decarbonized iron or steel is then poured through sprue-holes or in gates formed in the cope G, so as to fill the space between the chill-ring E and periphery of the body 0, and by its greater heat remelt the partiallycooled periphery of the body portion 0, so as to firmly unite therewith, so as to become, when cooled, one continuous casting throughout the soft-iron central body portion, and the hardsteel tire having a chilled periphery or tread.

By means of our improved mold above described, the labor of putting on the second cope, G, at a separate operation, as heretofore necessary, is avoided, as the cope G is first placed upon the top of the chill-ring E, and then both are put onto the mold together at a single operation, thus very materially reducing the time intervening between the first and second pouring or casting of the two metals,

whereby a more thoroughand perfect union of the same is obtained.

Having thus described our invention, what we claim is- The combination of the metal ring B, havin g a conical or incline interior face, and provided with the horizontal flange a, and the chill-ring E, with the copes D and G and base portion A, forming a mold for casting carwheels from two metals, substantially as described, as and for the purposes set forth.

Witness our hands this 15th day of Decemher, A. D. 1880.

ZADOOK S. ,VVASHBURN. LUOIUS W. WASHBURN. In presence of P. E. TESCHEMAOHER, WM. J. CAMBRIDGE. 

